침소봉대.

A Series of Unfortunate Events #5: The Austere Academy (Hardcover, Deckle Edge) ㅣ A Series of Unfortunate Events #05 2
레모니 스니켓 지음, Brette Helquist 그림 / Harper Collins / 2000년 8월

"Making a mountain out of a mole hill" simply means a big deal out of something that is actually a small deal.